Method of construction for draining the ground and the like

ABSTRACT

A method of construction for draining the ground in which water rarely permeates into the underground, and water is drained from the ground in a short period of time and dried. The method includes the steps of: as shown in FIG.  3 , digging the circumference of the surface of ground requiring draining of the ground ( 1 ) to form a waterway ( 3 ); building up a central portion of the surface of ground within the waterway ( 3 ) and carrying out leveling by rolling with roller to form a foundation bed ( 2 ); covering the whole surface of the foundation bed ( 2 ) with corrugated plates of plastics ( 7 ) having convex portions ( 18 ) and concave portions ( 19 ); laminating crushed stones; covering the crushed stones ( 8 ) with the ground surface earth ( 9 ), and causing water permeated into the ground surface earth ( 9 ) due to rainfall or the like to flow into the peripheral waterway ( 3 ) from the concave portions ( 19 ) of the corrugated plates of plastics ( 7 ) to effect draining.

BACKGROUND OF THE INVENTION

[0001] In the grounds such as various ball game stadiums and track- andfield stadiums, or parks, golf ranges, construction sites, the gentleinclined normal of cultivated lands or mountain districts, and the like(which will be generally referred to as “the ground” hereinafter in thepresent specification and claims), when it rains, rainwater is to bepermeated into the earth of the ground, and when the ground becomeswetted, the function of the ground is lost. Then, for maintaining theprimary function of the ground, it is necessary to drain the permeatedwater from the earth to dry the earth of the ground. Then, the method ofconstruction for draining the ground is applied to the ground asdescribed above, and draining means is provided.

[0002] In the draining means according to the conventional method ofdrainage, there is provided under the ground with a drainage-ditch net30 comprising ditches 31 as shown in a plan view of FIG. 14A. Sand orcrushed stones 32 are laid on the bottom of the ditches 31 of thedrainage-ditch net 30, on which is laid a water permeation pipe 33constituting a water permeation construction in which water permeationholes 35 are provided in a pipe wall 34 as shown in FIG. 14C. Theperipheral surface of the water permeation pipe 33 is covered with sandor the crushed stones 32 as shown in FIG. 14B, and the side portions andupper portions thereof are covered with the earth for burying back theditches 31.

[0003] In the ground 1 applied with the draining means according to theconventional method of drainage, when the rainfall such as rainwaterpermeates into the earth, the permeated water flows, through the waterpermeation holes 35, into the water permeation pipe 33 laid in the ditch31 dug therearound, and is drained from a drain of the ditch 31 passingthrough the water permeation pipe 33.

[0004] However, in the draining means according to the conventionalmethod of construction for draining the ground, water permeated due torainfall or the like flows into the water permeation pipe 33 in theditch 31 and is drained, but the total amount of water flown is notalways drained by the water permeation pipe 33 but part of water onceflown into the water permeation pipe 33 flows back and leaks into theperipheral earth from the water permeation holes 35 of the waterpermeation pipe 33 to wet the earth of the ground 1 again. Because ofthis, in the draining means according to the conventional method ofconstruction for draining the ground, it is not assured that therainfall such as rainwater from the water permeation pipe 33 can bedrained positively in a short period of time. Therefore, it takes a longtime till the whole ground 1 containing water due to the rainfall isdried. At the time of the large amount of rainfall, draining of theground cannot be done as intended, and the amount of water leaking fromthe water permeation pipe 33 increases, giving rise to disaster, and inthe normal of the mountain districts and the like, there sometimesoccurs a landslide or the like.

SUMMARY OF THE INVENTION

[0005] The present invention provides a new method of construction fordraining the ground developed in order to overcome the problems as notedabove with respect to the conventional method of construction fordraining the ground as described above. That is, there is provided amethod of construction for draining the ground wherein even if thesurface layer of the ground comprising crushed stones laid on thefoundation of the ground and the surface earth thereon is wetted byrainwater or the like, water is not permeated into the earth under thedraining member buried in the ground according to the method ofconstruction for draining the ground of the present invention, and waterpermeated into the surface layer of the ground on the draining member isdrained in a short period of time whereby the surface layer of theground can be dried positively.

[0006] To this end, the surface of the earth around the ground thatrequires draining is dug to form a waterway, the central portion of theground within the waterway is heaped from the peripheral portion of theground, and afterward, the ground is graded by rolling with a roller toform a foundation bed of the ground. The whole surface of the foundationbed of the ground is covered with corrugated plates of plastics having acontinuous corrugated surface whose surface is that a plurality ofconvex portions and a plurality of concave portions are alternatelycontinuous. Further, crushed stones to facilitate the permeation ofwater are laid on the corrugated plates of plastics that cover thefoundation bed, and further, the surface of the crushed stones iscovered with the surface earth of the ground to form the ground to whichdrainage is applied. In the ground to which drainage is applied, whenwater is permeated into the surface earth due to the rainfall or thelike, the permeated water is cut off on the corrugated plates ofplastics, gathered in the concave portions of the corrugated plates ofplastics, and caused to flow into the waterway provided in the peripheryof the ground from the concave portions. Thus the surface earth of theground is drained.

[0007] As a result of carrying out the method of construction fordraining the ground as described above, water permeated into the surfaceearth of the ground due to rainfall or the like is received by thecorrugated plates of plastics, caused to flow into the waterway formedin the surroundings of the ground from the concave portions of thecorrugated plates of plastics and drained whereby the surface layer ofthe ground can be dried more quickly, thus enabling the recovery of theoriginal function of the ground more quickly.

BRIEF DESCRIPTION OF THE DRAWINGS

[0008]FIG. 1 shows an outline of the foundation bed of the ground in themethod of construction for draining the ground according to the presentinvention, FIG. 1A being a plan view of the foundation bed, FIG. 1Bbeing an elevation taken on 1B-1B of FIG. 1A.

[0009]FIG. 2 schematically shows a corrugated plate of plastics whichcovers the foundation bed in the method of construction for draining theground according to the present invention, FIG. 2A being a plan view,FIG. 2B being an elevation taken on 2B-2B of FIG. 2A.

[0010]FIG. 3 is a sectional view schematically showing part of theground applied with the method of construction for draining the groundusing the foundation bed shown in FIG. 1.

[0011]FIG. 4 is a sectional view schematically showing the sectionalconstruction of an embodiment applied with the method of constructionfor draining the ground in accordance with the present invention, FIGS.4A, 4B and 4C showing the embodiments of claim 1, claim 2 and claim 3,respectively.

[0012]FIG. 5 is a sectional view schematically showing the sectionalconstruction of a further embodiment applied with method of constructionfor draining the ground in accordance with the present invention, FIGS.5A, and 5B showing the embodiments of claim 4 and claim 5, respectively.

[0013]FIG. 6 is a sectional view schematically showing the embodiment inaccordance with the present invention in which a water tank is providedin the underground of the ground.

[0014]FIG. 7 is a perspective view of a corrugated plate of plasticshaving convex portions which are solid portions used for the method ofconstruction for draining the ground in accordance with the presentinvention.

[0015]FIG. 8 is a perspective view of a corrugated plate of plasticshaving convex portions which are solid portions used for method ofconstruction for draining the ground in accordance with the presentinvention.

[0016]FIG. 9 shows a corrugated plate of plastics shown in FIG. 7, FIGS.9A, 9B and 9C being a plan view, a sectional view taken on 9B-9B of FIG.9A and an elevation a nail for fastening a corrugated plate of plastics,respectively.

[0017]FIG. 10 is a sectional view of a side of a corrugated plate ofplastics comprising convex portions different in height.

[0018]FIG. 11 is a plan view of a corrugated plate of plastics whose oneend is bored with a drain hole for draining, FIGS. 11A and 11B being acorrugated plate of plastics bored with drain holes in parallel in therow direction and a corrugated plate of plastics bored with drain holesvertically in the row direction, respectively.

[0019]FIG. 12 shows a corrugated plate of plastics bored with drainholes for draining in all concave portions, FIGS. 12A and 12B being aplan view of a corrugated plate of plastics having no integrally moldednon-slip bridge at the lower part, and a view in which the corrugatedplate of plastics bored with drain holes for draining of FIG. 12A iswound to form a water permeation tube, respectively.

[0020]FIG. 13 shows several types of a joining plate of plastics forpreventing water from leaking from the connecting portion of thecorrugated plates of plastics, FIGS. 13A, 13B and 13C being a joiningplate of plastics having concave portions and convex portions at rightangles to the connecting portion of the corrugated plates of plastics, ajoining plate of plastics having concave portions and convex portions inparallel with the connecting portion of the corrugated plates ofplastics, and a joining plate of plastics having concave portions andconvex portions in the direction obliquely with respect to theconnecting portion of the corrugated plates of plastics, respectively.

[0021]FIG. 14 is a schematic explanatory view of the ground according tothe conventional method of drainage, FIGS. 14A, 14B and 14C being a planview of the ground provided with a drainage-ditch net, a sectional viewshowing the construction of ditches of the drainage-ditch net, and aperspective view of a water permeation pipe for draining, respectively.

[0022] The reference numerals appearing in FIG. 1 to FIG. 14 aredescribed as follows: 1: ground, 2: foundation bed, 3: waterway, 4:ditch block, 5: central portion, 6: peripheral portion, 7: corrugatedplate of plastics, 8: crushed stones, 9: surface earth of the ground,10: water permeation mat, 11: water permeation mat, 12: sand stones, 13:water permeation mat, 14: water tank, 15: drain, 16: side end parallelwith convex portion, 17: side end parallel with convex portion, 18:convex portion, 19: concave portion, 20: convex pattern 21: hollowportion, 22: solid portion, 23: bridge, 24: nail, 25: drain hole, 26:waterway upper surface, 27: water permeation tube, 28: joining plate ofthe plastics, 29: folded line, 30: drainage-ditch net, 31: ditch, 32:crushed stones, 33: water permeation pipe, 34: pipe wall, 35: waterpermeation hole.

DETAILED DESCRIPTION OF THE INVENTION

[0023] The invention according to claim 1 provides a method ofconstruction for draining the surface earth of the ground 1, the methodcomprising the steps of: digging the earth around the ground 1 requiringdrainage of the ground 1 to form a waterway 3 around the surface of theground 1; heaping up a central portion of the ground 1 within thewaterway 3 from a peripheral portion of the ground 1 and grading theheaped ground 1 by rolling with a roller to form a foundation bed 2 ofthe ground 1; covering the whole surface of the foundation bed 2 withcorrugated plates of plastics 7 of which surface comprises a continuouscorrugated surface in which a number of convex portions 18 and a numberof concave portions 19 in the same direction as the convex portions 18are continuous alternately; laying crushed stones 8 on the corrugatedplates of plastics 7; covering the laid crushed stones 8 with the earthto form the surface earth 9, of the ground 1 and causing water permeatedinto the surface earth 9 of the ground 1 due to rainfall or the like toaccumulate into the concave portion 19 of the corrugated plates ofplastics 7 and to flow into the waterway 3 from the concave portions 19of the corrugated plates of plastics 7 to effect draining.

[0024] The invention according to claim 2 provides the method ofconstruction for draining the ground of claim 1 wherein a waterpermeation mat 10 comprising natural fiber such as coconut nutshell orsynthetic coarse and meshed fiber which is laid in place of the crushedstones 8 laid on the corrugated plates of plastics 7.

[0025] The invention according to claim 3 provides the method ofconstruction for draining the ground of claim 1 wherein a waterpermeation mat 10 is interposed between the corrugated plates ofplastics 7 and the crushed stones 8 laid thereon.

[0026] The invention according to claim 4 provides the method ofconstruction for draining the ground of claim 1 wherein a waterpermeation mat 11 comprising natural fiber such as coconut nutshell orsynthetic coarse and meshed fiber which is interposed between thecrushed stones 8 laid on the corrugated plates of plastics 7 and thesurface earth 9 of the ground 1 laid thereon.

[0027] The invention according to claim 5 provides the method ofconstruction for draining the ground of claim 1 wherein the waterpermeation mat 10 is interposed between the corrugated plates ofplastics 7 and the crushed stones 8 laid thereon, and the waterpermeation mat 11 is interposed between the crushed stones 8 and thesurface earth 9 of the ground 1 laid thereon.

[0028] The invention according to claim 6 provides the method ofconstruction for draining the ground of any one of claims 1 to 5 whereina water tank 14 is constructed in the underground of the foundation bed2 of the ground 1 surrounded by the waterway 3, and the waterway 3 inthe surroundings of the ground 1 is connected to the water tank 14 forstoring water gathered from the surface earth 9 of the ground 1 to thewaterway 3.

[0029] The embodiments of the present invention will be explainedhereinafter with reference to the drawings. As shown in FIG. 1, theperipheral surface earth of the ground 1 which the method ofconstruction for draining the ground is required is dug, and theconcrete ditch block 4 are laid on the dug place to form a waterway 3. Acentral portion 5 of the surface earth of the ground 1 within thewaterway 3 is heaped up higher than a peripheral portion 6, and gradingis done by rolling with roller to form a foundation bed 2. The wholesurface of the foundation bed 2 formed as described above is covered byconnecting a plurality of corrugated plates of plastics 7 comprising analternate combination of convex portions 18 and concave portions 19which are put one upon another with the lower end thereof placed on thehigher land side piled up the upper end thereof placed on the lower landside, as shown in FIGS. 2A and 2B. In this case, when covering in amanner such that the row direction of the convex portions 18 and theconcave portions 19 is in the inclined direction of the foundation bed2, water gathered in the concave portions 19 flows easily to thedownstream. In this case, the corrugated plates of plastics 7 to be usedare rectangular, but where the direction is changed from the rowdirection of the convex portions 18 and the concave portions 19 of theadjacent corrugated plates of plastics 7 adjusting to the inclination ofthe foundation bed 2, the rectangular corrugated plates of plastics 7are suitably cut obliquely for use, and as shown in FIG. 2A, thecorrugated plates of plastics 7 are placed in contact in the state thatthe row direction of the convex portions 18 and the concave portions 19of the connected corrugated plates of plastics 7 is at right angles.

[0030] Next, in the embodiment of the invention according to claim 1,there is provided a method wherein the crushed stones 8 are laid on thecorrugated plates of plastics 7 covering the whole surface of thefoundation bed 2, and the crushed stones 8 are covered with the surfaceearth 9 of the ground 1. In this case, the crushed stones 8 having alarge diameter are used for the lower part of the layer of the crushedstones so as to prevent the crushed stones 8 from falling down into theconcave portions 19 of the corrugated plates of plastics. In this case,as shown in FIG. 4A, when sand stones 12 having a small diameter areused for the upper part of the layer of the crushed stones, it ispossible to prevent fine grains of the surface earth 9 of the ground 1from entering the concave portions due to the presence of the smalldiameter sand stones 12.

[0031] In the embodiment of the invention according to claim 2, there isprovided a method wherein a water permeation mat 10, comprising naturalfiber such as coconut nutshell or synthetic fiber and comprising thelayered fibers of coarse meshes to a degree that not pass the surfaceearth 9 of the ground 1 but pass only water, is laid in place of thecrushed stones 8 laid on the corrugated plates of plastics 7 in theembodiment of the invention according to claim 1, above of which iscovered directly with the surface earth 9 of the ground 1, whichconstruction is shown in FIG. 4B.

[0032] In the embodiment of the invention according to claim 3, there isprovided a method wherein as shown in FIG. 4C, the crushed stones 8 arefurther laid on the water permeation mat 10 which is laid on thecorrugated plates of plastics 7 in the embodiment of the inventionaccording to claim 2, and the crushed stones 8 are covered with thesurface earth 9 of the ground 1. In this case, since the waterpermeation mat 10 is present on the lower layer of the crushed stones 8,the crushed stones 8 are not fallen into the concave portions 19 of thecorrugated plates of plastics 7. Therefore, its diameter will suffice tobe relatively small, but as the crushed stones 8 to be laid, thelarge-diameter crushed stones 8 may be used for the lower part, and thesmall-diameter sand stones 12 may be used for the upper part.

[0033] In the embodiment of the invention according to claim 4, there isprovided a method wherein as shown in FIG. 5A, the crushed stones 8 arelaid on the corrugated plates of plastics 7, a water permeation mat 11formed of material similar to the water permeation mat 10 is furtherlaid thereon, and the water permeation mat II is covered with thesurface earth 9 of the ground 1. Also in this case, as the crushedstones 8 to be laid, the large-diameter crushed stones 8 are used forthe lower part, and the small-diameter sand stones 12 are used for theupper part to prevent the crushed stones 8 from falling into the concaveportions 19 of the corrugated plates of plastics 7.

[0034] In the embodiment of the invention according to claim 5, there isprovided a method wherein the water permeation mat 10 is laid on methodof construction for draining the ground covered the foundation bed 2,the crushed stones 8 are laid thereon, and the water permeation mat 11is laid on the crushed stones 8, which is then covered with the surfaceearth 9 of the ground 1. This construction is shown FIG. 3 or FIG. 5B.In this case, since the water permeation mat 10 is present under thecrushed stones 8, the large-diameter crushed stones 8 can be used.

[0035] As described above, in the ground 1 formed with the drainingmeans by the method of construction for draining the ground of theinventions according to claims 1 to 5, water permeated into the surfaceearth 9 of the ground due to rainfall or the like is caused to flow intothe peripheral waterway 3 from the concave portions 19 of the corrugatedplates of plastics 7 laid on the foundation bed 2 to effect draining. Inthis case, the foundation bed 2 of the ground 1 is covered in its wholesurface with the corrugated plates of plastics 7, water such asrainwater is not permeated into the foundation bed 2 passing through thecorrugated plates of plastics 7 but is drained quickly to the waterway 3provided in the periphery from the concave portions 19 of the corrugatedplates of plastics 7, and therefore, when the rainfall stops, the ground1 can be dried in a short period of time and used.

[0036] The crushed stones 8, the water permeation mat 10 and the waterpermeation mat 11 are used adjusting to the rainfall amount so as not beclogged by the fine-particle earth such as the surface earth 9 of theground 1. Either the water permeation mat 10 or the water permeation mat11 is used while being interposed as described above or both of them canbe used while being interposed simultaneously.

[0037] In the method of construction for draining the ground 1 or thelike described above, the water tank 14 can be provided in theunderground of the foundation bed 2 of the ground 1. The waterway 3around the ground is connected to the water tank 14, and water gatheredfrom the ground surface earth 9 to the waterway 3 is stored in the watertank 14. In this case, a drain 15 is provided in the waterway 3 leadingto the water tank 14 so that water may be drained suitably to otherplaces. When water is stored in the water tank 14 provided in theunderground of the foundation bed 2 of the ground 1, the function as asort of dam is given to prevent flood in cities, and further beingprepared for the water shortage. Further, water is removed from thewater tank 14 to enable utilization for a shelter, preparing for crisismanagement.

[0038] The corrugated plates of plastics 7 used for the method ofconstruction for draining the ground according to the present inventionwill be further described. In the corrugated plates of plastics 7, asshown in FIGS. 7 and 8, convex portions 18 are disposed on one side end16 and the other side end 17 opposite the side end 16, a concave portion19 extending in the direction parallel with the convex portion 18 isprovided adjacent to the convex portion 18, and the convex portion 18 isprovided adjacent to the concave portion 19. In this manner, the convexportions 18 and the concave portions 19 are alternately combined to formthe corrugated plates of plastics 7 comprising a continuous corrugatedsurface. FIG. 9 shows the corrugated plates of plastics 7 shown in FIG.7. FIG. 9A is a plan view where a convex pattern 20 for holding thecrushed stones on the upper surface at the concave portions 19 is formedon the convex portion 18, FIG. 9B is a sectional view taken on 9B-9B ofFIG. 9A where a non-slip bridge 23 at the inclined surface of thefoundation bed 2 is provided on the lower surface of the corrugatedplates of plastics 7 at right angles to the row direction of the convexportions 18 and the concave portions 19. One at the left end of theconvex portions 18 is concave, in the lower surface thereof, of a hollowportion 21, but another convex portions 18 are all in the form of asolid portion 22. FIG. 9C shows a nail 24 for fastening.

[0039] In the method of construction for draining the ground accordingto the present invention, adjacent to one corrugated plate of plastics 7is disposed next corrugated plate of plastics 7, ends of which are putone upon another and connected. That is, the convex portion 18 arrangedon one side end 16 of the corrugated plates of plastics 7 is put on theconvex portion 18 arranged on the other side end 17 of the othercorrugated plate of plastics 7 and connected together. Accordingly, theconvex portion 18 on one side end 16 is always concave in section havingthe hollow portion 21 on the backside as shown in FIG. 7.

[0040] Further, also with respect to both the ends in the row directionand at right angle to the convex portion 18 and the concave portion 19,one end 36 is always concave in section having the hollow portion 21 onthe backside of the convex portion 18, and can be put on the other end37 of another same-shaped corrugated plate of plastics 7 connected inthe row direction of the convex portion 18 and the concave portion 19.

[0041] The duplicated end portion of the above said two corrugatedplates of plastics 7 is fastened with a nail 24 shown in FIG. 9C so thatthey are not shifted from each other.

[0042] Further, the upper surface of the convex portion 18 of thecorrugated plates of plastics 7 is formed in the whole surface with aconvex pattern 20 for holding the crushed stones to the right place inorder that the crushed stones 8 laid thereon can be stopped slippingdown.

[0043] Furthermore, the corrugated plates of plastics 7 are formed inthe backside thereof with a non-slipping crosspiece 23 so as not to beslipped down from the foundation bed 2. The crosspieces 23 may be moldedintegrally with a corrugated plate of plastics 7. For the purpose ofmaking the non-slipping more effective, the crosspiece 23 is formed soas to be the direction crossing the inclined surface of the foundationbed 2 when the corrugated plates of plastics 7 are laid on thefoundation bed 2. Further, the crosspiece 23 also carries out the dutyof reinforcing the corrugated plate of plastics 7 and adjusting thethickness thereof, in addition to the non-slipping effect.

[0044] With respect to the back of the convex portion 18 of thecorrugated plates of plastics 7, the back of the convex portion 18 ofone side end 16 is the hollow portion 21, and the back of all otherconvex portions 18 is the solid portion 22 in order to withstand theload of the ground. FIG. 7 shows the solid portion 22. However, in caseof the corrugated plates of plastics 7 formed of a material capable ofwithstanding the load, the back of all the convex portions 18 includingthe convex portion 18 on one side end 16 may be the solid portion 21 asshown in FIG. 8.

[0045] The height of the convex portion 18 of the corrugated plates ofplastics 7 may be varied according to the grade of the foundation bed 2or the water amount to be drained. That is, where there is much wateramount to be drained, the height of the convex portion 18 is made high,as a result of which the depth of the concave portion 19 is made deep.For example, as shown in FIG. 10, in the single corrugated plate ofplastics 7, the height of the convex portion 18 is made different inleft from right adjusting to the grade of the slant of the foundationbed 2, and these corrugated plates of plastics 7 are continuouslyconnected to regulate the drain amount of the whole ground 1.

[0046] In laying the corrugated plates of plastics 7, the end in thedirection of the convex portion of the corrugated plates of plastics 7which is present in the higher place of the foundation bed 2 is put onthe end in the direction of the convex portion of the corrugated platesof plastics 7 which is present in the lower place of the foundation bed2 to thereby prevent running water from the upstream from entering theportion under the lower-side corrugated plates of plastics 7.

[0047] Further, for covering the joint between the two corrugated platesof plastics 7, 7 adjacent to each other, an elongated joining plate ofplastics 28 is placed over the joint as shown in FIG. 13. The joiningplate of plastics 28 can be folded suitably at a folding line 29, and isformed so that the former may come in contact with and place in closecontact with the lower corrugated plates of plastics 7, 7. Further,adjusting to the corrugated surface comprising the convex portions 18and the concave portions 19 of the lower corrugated plates of plastics7, 7, the convex portions 18 and the concave portions 19 of thecorrugated plates of plastics 7 are provided in the lateral direction asshown in FIG. 13A, the convex portions 18 and the concave portions 19are provided in the longitudinal direction in the row direction as shownin FIG. 13B, and the convex portions 18 and the concave portions 19 areformed in the oblique direction as shown in FIG. 13C.

[0048] In the corrugated plates of plastics 7 for covering the waterway3 in the periphery of the ground 1, drain holes 25 comprisingthrough-holes are provided in the bottoms 26 of the concave portions 19corresponding to the portion of the upper surface of the waterway 3 asshown in FIG. 11A or FIG. 11B, and water flowing from the concaveportions 19 is dropped down from the drain holes 25 to the waterway 3under them.

[0049] Incidentally as shown in FIG. 12A, in the corrugated plates ofplastics 7 in which the non-slipping crosspiece 23 is not present on theback thereof, when the drain holes 25 are provided in the bottoms of allthe concave portions 19 of the corrugated plates of plastics 7, thecorrugated plates of plastics 7 can be wound to form a water permeationtube 27 in which the drain holes 25 are water permeation holes 35, asshown in FIG. 12B.

[0050] Then, as shown in FIG. 14A, when ditches 31 are provided in anet-like form in the ground 1 according to the conventional method, inthe draining facility in which a water permeation pipe 33 having anumber of water permeation holes 35 bored in a peripheral pipe wall 34shown in FIG. 14C is laid into the crushed stones 32 crammed into theditches 31 as shown in FIG. 14B, the water permeation tube 27 having thecorrugated plates of plastics 7 wound can be used in place of the waterpermeation pipe 33 to lay the drainage-ditch net 30 in the ground 1.

[0051] In case of the ground 1 such as a golf course having a largearea, the drainage-ditch net 30 as described above is provided inadvance in the underground, the water permeation tube 27 is laid in theditches 31 of the drainage-ditch net 30 and the crushed stones 32 arecrammed and the earth is placed thereover to form the foundation bed 2,the crushed stones or the water permeation mat are laid on thefoundation bed 2, and are covered with the surface earth to form themethod of construction for draining the ground. However, alternatively,the corrugated plates of plastics 7 may be laid on the foundation bed 2according to the method of construction for draining the ground of thepresent invention to provide the method of construction for draining theground.

[0052] The corrugated plates of plastics 7 used in the method ofconstruction for draining the ground of the present invention is removedas waste plastics, when the ground is returned to the original surfaceearth of the ground or when being reformed, to use it effectively byrecycling, and can be used again as raw material of plastics, thusmaking effective use of resources, and not contaminating theenvironments.

[0053] As explained above, the present invention provides the method ofdraining of the ground of preventing water such as rainfall from beingpermeated into the foundation bed by the corrugated plates of plastics.Therefore, the efficiency of draining the ground is excellent, and theground can be drained and dried in a very short period of time, and theefficiency of utilization of the ground can be improved. Further, sincethe water tank is provided in the underground of the ground to enablestorage of a huge amount of water, one can deal with emergency, which isone of the excellent merits provided by the present invention.

What is claimed is:
 1. A method of construction for draining the ground,said method comprising the steps of: digging the earth around the groundrequiring drainage of the ground to form a waterway around the ground;heaping up earth on a central portion of the ground within the waterwayand grading the heaped ground with a roller to form a foundation bed ofthe ground; covering the whole surface of the foundation bed withcorrugated plates of plastics of which surface comprises a continuouscorrugated surface in which a number of convex portions and a number ofconcave portions are continuous alternately; laying crushed stones onthe corrugated plates of plastics; covering the laid crushed stones withthe earth to form the surface earth of the ground, and causing waterpermeated into the surface earth of the ground due to rainfall or thelike to accumulate into the concave portions of the plates of plasticsand to flow into the waterway from the concave portions of the plates ofplastics to effect draining.
 2. The method of construction for drainingthe ground of claim 1 wherein a water permeation mat is laid in place ofthe crushed stones which is laid on the corrugated plates of plastics.3. The method of construction for draining the ground of claim 1 whereina water permeation mat is interposed between the corrugated plates ofplastics and the crushed stones laid thereon.
 4. The method ofconstruction for draining the ground of claim 1 wherein a waterpermeation mat is interposed between the crushed stones laid on thecorrugated plates of plastics and the surface earth of the ground heapedthereon.
 5. The method of construction for draining the ground of claim1 wherein a water permeation mat is interposed between the corrugatedplates of plastics and the crushed stones laid thereon, and a waterpermeation mat is also interposed between the crushed stones and thesurface earth of the ground heaped thereon.
 6. The method ofconstruction for draining the ground of any of claims 1 to 5 wherein awater tank is constructed in the underground of the foundation bed ofthe ground surrounded by the waterway, and the waterway in thesurroundings of the ground is connected to the water tank for storingthe water gathered from the surface earth of the ground to the waterway.